This is from the Great Barrier Reef Marine Park Authority website -
http://www.gbrmpa.gov.au/
Navigate around the site for the information you need.
There is a list of Protected Species for the Great Barrier Reef Marine Park, these species include:
Some shells - helmet shells, triton shells, tridacnid clams
Some fish - seahorses, pipefish, sea dragons, potato cod, Queensland grouper, barramundi cod, Maori wrasse, all groupers (Epinephelus) more than 100cm
Some sharks - whale shark, grey nurse shark, great white shark, freshwater and green sawfish
Sea snakes
Crocodiles
Marine turtles
Birds
Seals
Whales and Dolphins
Dugongs.